The decision to bring the Study to early clinical readout came in response to COVID-19's evolution as a disease, and the significant changes in the standard of care, leading to an increase in the severity of conditions of the intubated patients.

This clinical trial will examine if a new treatment of Mesenchymal-like Adherent stromal Cells (called PLX-PAD) can help patients intubated and mechanically ventilated due to COVID-19 to recover more quickly with less complications.

Key Inclusion Criteria:

• Willing and able to provide written informed consent, or with a legal representative who can provide informed consent.
• Male or non-pregnant female adult 18-85 years of age at time of enrollment.
• Laboratory-confirmed SARS-CoV-2 infection as determined by PCR, in any specimen up to 21 days prior to randomization.
• Meets definition of ARDS according to Berlin criteria.

Key Exclusion Criteria:

• Body weight under 55 kg (121 lbs)
• Serum creatinine level of over 1.5 mg/dL at time of randomization.
• Total Bilirubin ≥2 mg/dL at time of randomization.
• Known allergy to any of the following: dimethyl sulfoxide (DMSO), human serum albumin, bovine serum albumin.
• Stroke or acute myocardial infarction/unstable angina within 3 months prior to randomization.
• Chronic Obstructive Pulmonary disease GOLD stage above II.